Pump-piston



S. W. GEORGE.

PUMP PISTON.

I Patented Mar.20, 1883.

(No Model.)

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U ITED STATES PATENT OFFICE.

SAMSON w. GEORGE, or CHESTER, NEW JERSEY.

PUMP-PlSTON;

SPECIFICATION forming part of Letters Patent No. 274,308, dated March20, 1883.

Application filedOetober 2.1882. (NomodeL) To all whom it may concern:

. Be it known that I, SAMSON WILLIAM GEORGE, a citizen of the UnitedStates, residing at Chester, in the countyof Morris and State of NewJersey, have invented new and usefulImprovementsinPump-Pistons,ofwhich jfor the outer edge of the valve.

the following is a specification.

It is important that the piston or plunger of a lift-pun] p should haveprovision for adjusting the packing to the suction pipe or barrel, thatthe valve-part should be of a durable and effective construction, andthat the suction andlifting action of the pump should be as perfect aspossible. 1 t it My improvements are directed to the attainment of theseobjects in the production of a valved plungerin which the valve andthepacking parts are constructed with special reference to effect veryperfect operation in the pump; and these improvements will be made thesubject of specific claim. Referring to the accompanyingdrawings,Fignrelrepresentsavertical section of a pumppiston embracing myinvention, the valve being shown as closed in the lifting andsuctionactio-n; Fig. 2, a similar view, showing the valve open in theplunging action of the piston; and Fig. 3, a top view of the valve-seatcasting.

The valve on is placed at the top of the piston is of leather or rubber,of suitable thickness, and is seated so as to have an inverted conicalform, a fixed relation at its center to its seat and to the pump-rod,and opening and closing at its circumference with the seat. Thisconstruction gives an instantaneous and perfect seating function to theouter edge of the valve, allows it to open upon a fixed central seat,giving a free flow'for the water up through the piston, and requiring noweighting or re-enforcement.

The body of the piston is a'metal shell, b, of cylindrical form, open atboth ends, with an interior web, 0, having a central core with anopening, b, for receiving the pump-rod. The shell is formed with a toprim, (1, of a diameter a little less than the interior of the suctionpipe orbarrel, and is turned off atits inner upper edge to form abeveled seating-face, e, The top of the tubular core of the web 0 is ofa less height than the top rim, d, and forms the central part [of thevalve-seat,'upon which thevalve is clamped by a shoulder, f, on thepump-rod g, the latter passing through a central opening in the valve,thus giving itthe dish or inverted conical form and necessarily aconstant pressure upon its rim seating bevel e, regulated by thethickness or stifl'ness of the valve. In the plunging action o'fthepiston the valve is opened against such force or pressure, but must besufiiciently flexible to open readily. A key, h, driven through a slotinthe pump-rod. against the lower end of the tubular core of theshellweb, serves to secure the piston to the pumprod by the same forceby which the valve is clamped upon its central seat, in which theshoulder f and the key co-operate to form such clamp and a removablefastening for the valve and for the piston. For large-sized pumpssuch asused in mining operationsa metal disk may be placed between the shoulderf and the valve, the object being to allow the valve.

to open to a limited extent at its circumference from a fixed centerseat.

Apacking-ring, i,of rubber or other suitable material, is fitted uponthe shell against its top rim, (1, and forms the wearing-surface of thepiston, the shell portion of which should be of such diameter as toallow the use of a packing-ring of proper thickness. The shell extendsbelow the packing to receive a loosely-fitting metal-ring follower, j,having a diameter preferably equal to that of the top rim, and abuttingagainst the lower edge of the packing-ring, so as to bind it against thetop To compensate for the surface-wear of the packing-ring, I providemeans by which it is compressed against the top rim to increase itsdiameter or swell it laterally, and thereby maintainaclose and properworking joint with thesuction-pipe. The provision for this purposeconsists of a cross-head, k, fitting loosely upon the pump-rod, with itsarms preferably seated in recesses or notches in the lower end of thering-follower, against which it is bound by jam-nuts I, screwed upon thelower threaded end of the pump-rod against the eyed part of saidcross-head. By setting up these,

nuts the cross-head is forced hard against the ring-follower, whichthereby compresses the.

packing-ring and expands it to the desired degree as it becomes worn.The construction allows the parts to be readily separated to renew thepacking and the'valve.

I have stated that the key and the pumprod shoulder co -operate tosecure both the valve and the piston upon the pump-rod; but it isobvious that the cross-head and the said shoulder may form the clamp forthe valve upon its seat, a clamp for the piston upon its rod, and aclamp by which to confine and to adjust the packing-rim g in relation toits wearing-joint. I have also described the valve as being seated inthe form of an inverted cone, and prefer such form as giving the bestresults; but it may be seated in a plane at right angles to thepump-rod. I have also shown the ring-follower and the cross-head asbeing separate and distinct parts, and prefer to so make them; but it isobvious that the ringfollower may be cast with a skeleton end having acentral opening, and the single casting fitted upon thepump-rod and uponthe lower cylindrical part of the shell of the piston and answer thesame purpose.

I.claim 1. The combination of the pump-rod having the shoulderf, and awebbed shell, I), having a tubular core, b, and a top rim, d, beveled at6, with a flexible valve, a, bound at its center and seated in the formof an inverted cone opening and closing at its circumference upon thesaid rim-bevel, substantially as described, for the purpose specified.

l 2. In combination,inapump-piston,theshell having an interior web, 0, atubular core, I), and a top rim, d, projecting beyond the end of saidcore, and formed with a valve seating bevel, c, the pump-rod having ashoulder,f, the flexible valve a, seated upon the end of the core andopening and closing at its circumference upon said rim-seat, and the keyh, passing through a slot in the pump-rod against the lower end of theshell-core, whereby the valve is secured upon said shell-core and thepiston upon the rod.

3. The pump-piston herein described, consisting of the webbed'shellhaving a top beveled rim, (1, a tubular core, and a cylindrical body,the pump-rod having the shoulder], the packing-ring i, thering-followerj, the crossnuts I, and the key h, all constructed andarranged substantially as described, for the purpose specified.

Intestimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

SAMSON WILLIAM GEORGE.

Witnesses:

H. W. 00131312, 0. E. THURBER.

